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cache: add implementation for cache-less systems

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Add NOP functions to allow writing cache-availabiliy-agnostic code.

Change-Id: Id8e392271329095abad3db6856a4e621702d1dae
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2015-10-30 17:04:00 -04:00 • committed by Anas Nashif
commit 7b526e2447
1 changed files with 25 additions and 2 deletions
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27
include/cache.h
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@ -23,21 +23,44 @@
extern "C" { extern "C" {
#endif #endif
#if defined(CONFIG_CACHE_FLUSHING)
#define _sys_cache_flush_sig(x) void (x)(vaddr_t virt, size_t size) #define _sys_cache_flush_sig(x) void (x)(vaddr_t virt, size_t size)
#if defined(CONFIG_CACHE_FLUSHING)
#if defined(CONFIG_ARCH_CACHE_FLUSH_DETECT) #if defined(CONFIG_ARCH_CACHE_FLUSH_DETECT)
typedef _sys_cache_flush_sig(_sys_cache_flush_t); typedef _sys_cache_flush_sig(_sys_cache_flush_t);
extern _sys_cache_flush_t *sys_cache_flush; extern _sys_cache_flush_t *sys_cache_flush;
#else #else
extern _sys_cache_flush_sig(sys_cache_flush); extern _sys_cache_flush_sig(sys_cache_flush);
#endif #endif
#else
/*
* Provide NOP APIs for systems that do not have caches.
*
* An example is the Cortex-M chips. However, the functions are provided so
* that code that need to manipulate caches can be written in an
* architecture-agnostic manner. The functions do nothing. The cache line size
* value is always 0.
*/
static inline _sys_cache_flush_sig(sys_cache_flush)
{
ARG_UNUSED(virt);
ARG_UNUSED(size);
/* do nothing */
}
#endif /* CACHE_FLUSHING */ #endif /* CACHE_FLUSHING */
#if defined(CONFIG_CACHE_LINE_SIZE_DETECT) #if defined(CONFIG_CACHE_LINE_SIZE_DETECT)
extern size_t sys_cache_line_size; extern size_t sys_cache_line_size;
#else #elif defined(CONFIG_CACHE_LINE_SIZE)
#define sys_cache_line_size CONFIG_CACHE_LINE_SIZE #define sys_cache_line_size CONFIG_CACHE_LINE_SIZE
#else
#define sys_cache_line_size 0
#endif #endif
#ifdef __cplusplus #ifdef __cplusplus